/**
 * Created by scutterry on 15/4/21.
 */
function sha1(str) {
    //  discuss at: http://phpjs.org/functions/sha1/
    // original by: Webtoolkit.info (http://www.webtoolkit.info/)
    // improved by: Michael White (http://getsprink.com)
    // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    //    input by: Brett Zamir (http://brett-zamir.me)
    //   example 1: sha1('Kevin van Zonneveld');
    //   returns 1: '54916d2e62f65b3afa6e192e6a601cdbe5cb5897'

    var rotate_left = function (n, s) {
        var t4 = (n << s) | (n >>> (32 - s));
        return t4;
    };

    /*var lsb_hex = function (val) {
     // Not in use; needed?
     var str="";
     var i;
     var vh;
     var vl;
     for ( i=0; i<=6; i+=2 ) {
     vh = (val>>>(i*4+4))&0x0f;
     vl = (val>>>(i*4))&0x0f;
     str += vh.toString(16) + vl.toString(16);
     }
     return str;
     };*/

    var cvt_hex = function (val) {
        var str = '';
        var i;
        var v;

        for (i = 7; i >= 0; i--) {
            v = (val >>> (i * 4)) & 0x0f;
            str += v.toString(16);
        }
        return str;
    };

    var blockstart;
    var i, j;
    var W = new Array(80);
    var H0 = 0x67452301;
    var H1 = 0xEFCDAB89;
    var H2 = 0x98BADCFE;
    var H3 = 0x10325476;
    var H4 = 0xC3D2E1F0;
    var A, B, C, D, E;
    var temp;

    // utf8_encode
    str = unescape(encodeURIComponent(str));
    var str_len = str.length;

    var word_array = [];
    for (i = 0; i < str_len - 3; i += 4) {
        j = str.charCodeAt(i) << 24 | str.charCodeAt(i + 1) << 16 | str.charCodeAt(i + 2) << 8 | str.charCodeAt(i + 3);
        word_array.push(j);
    }

    switch (str_len % 4) {
        case 0:
            i = 0x080000000;
            break;
        case 1:
            i = str.charCodeAt(str_len - 1) << 24 | 0x0800000;
            break;
        case 2:
            i = str.charCodeAt(str_len - 2) << 24 | str.charCodeAt(str_len - 1) << 16 | 0x08000;
            break;
        case 3:
            i = str.charCodeAt(str_len - 3) << 24 | str.charCodeAt(str_len - 2) << 16 | str.charCodeAt(str_len - 1) <<
                8 | 0x80;
            break;
    }

    word_array.push(i);

    while ((word_array.length % 16) != 14) {
        word_array.push(0);
    }

    word_array.push(str_len >>> 29);
    word_array.push((str_len << 3) & 0x0ffffffff);

    for (blockstart = 0; blockstart < word_array.length; blockstart += 16) {
        for (i = 0; i < 16; i++) {
            W[i] = word_array[blockstart + i];
        }
        for (i = 16; i <= 79; i++) {
            W[i] = rotate_left(W[i - 3] ^ W[i - 8] ^ W[i - 14] ^ W[i - 16], 1);
        }

        A = H0;
        B = H1;
        C = H2;
        D = H3;
        E = H4;

        for (i = 0; i <= 19; i++) {
            temp = (rotate_left(A, 5) + ((B & C) | (~B & D)) + E + W[i] + 0x5A827999) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B, 30);
            B = A;
            A = temp;
        }

        for (i = 20; i <= 39; i++) {
            temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0x6ED9EBA1) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B, 30);
            B = A;
            A = temp;
        }

        for (i = 40; i <= 59; i++) {
            temp = (rotate_left(A, 5) + ((B & C) | (B & D) | (C & D)) + E + W[i] + 0x8F1BBCDC) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B, 30);
            B = A;
            A = temp;
        }

        for (i = 60; i <= 79; i++) {
            temp = (rotate_left(A, 5) + (B ^ C ^ D) + E + W[i] + 0xCA62C1D6) & 0x0ffffffff;
            E = D;
            D = C;
            C = rotate_left(B, 30);
            B = A;
            A = temp;
        }

        H0 = (H0 + A) & 0x0ffffffff;
        H1 = (H1 + B) & 0x0ffffffff;
        H2 = (H2 + C) & 0x0ffffffff;
        H3 = (H3 + D) & 0x0ffffffff;
        H4 = (H4 + E) & 0x0ffffffff;
    }

    temp = cvt_hex(H0) + cvt_hex(H1) + cvt_hex(H2) + cvt_hex(H3) + cvt_hex(H4);
    return temp.toLowerCase();
}